Observation of Umklapp processes in non-crystalline materials

Details Observation of Umklapp processes in non-crystalline materials Observation of Umklapp processes in non-crystalline materials

2000-10-03

arxiv.org/abs/cond-mat/0010048v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

13 pages PS

Scientific paper

10.1103/PhysRevB.64.012301

Umklapp processes are known to exist in cristalline materials, where they control important properties such as thermal conductivity, heat capacity and electrical conductivity. In this work we report the provocative observation of Umklapp processes in a non-periodical system, namely liquid Lithium. The lack of a well defined periodicity seems then not to prevent the existence of these scattering processes mechanisms provided that the local order of the systems i.e. the maxima of the static structure factor supply the equivalent of a reciprocal lattice vector in the case of cristalline materials.

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